CN1097141C

CN1097141C - Valve for sucking up gases from I. C. engine crankcase

Info

Publication number: CN1097141C
Application number: CN98807646A
Authority: CN
Inventors: F·哈尔克
Original assignee: Volkswagen AG
Current assignee: Volkswagen AG
Priority date: 1997-07-28
Filing date: 1998-06-12
Publication date: 2002-12-25
Anticipated expiration: 2018-06-12
Also published as: DE19732367A1; WO1999006679A1; CN1265173A; ATE224002T1; EP1000228A1; US6158423A; KR20010014128A; DE59805533D1; JP2001512207A; EP1000228B1; KR100491400B1

Abstract

The invention concerns a valve for sucking up gases from an internal combustion engine crankcase comprising a body (14, 16), a gas intake duct (32) connected to the crankcase inner space (12), a gas evacuating duct (28) connected to an air sucking duct of the internal combustion engine and a membrane (18) dividing the valve body (14, 16) into an inner chamber (22) on the crankcase side and an outer chamber (24) and having a suction valve attachment (34). Said membrane (18), jointly with the suction valve attachment (34), opens or closes at will the gas evacuating duct (28) according to the pressure difference between the two chambers (22, 24). The valve body (14, 16) outer chamber (24) is connected to the gas intake duct (32) and a ventilating duct (26) is provided on the crankcase side, said duct connecting the inner chamber (22) valve body (14, 16), on the crankcase side, to ambient pressure.

Description

The crankcase vent valve of internal-combustion engine

The present invention relates to a kind of crankcase vent valve as claim 1 internal-combustion engine as described in the preamble, it has suction tude that a valve casing, one and crankcase intracavity be communicated with, outlet pipe that links to each other with the sucking pipe of internal-combustion engine and a diaphragm, described diaphragm is divided into one with valve casing and has a ventilation valve valve head at the inner chamber of crankcase side and exocoel and it, and wherein diaphragm utilizes the ventilation valve valve head to open or close outlet pipe selectively according to the pressure reduction between these two chambeies.

One is a locking system that makes harmful matter such as oil gas and unburned hydrocarbon recirculation by the disclosed crankcase ventilation structure of DE4406986A1, EP0459031B1, DE2753335C2 and EP0730086A1 for example, they enter crankcase and arrive the firing chamber of motor from crankcase along piston, thereby these harmful matters do not leak in the environment.In this case, the suction tude of internal-combustion engine links to each other with the outlet of crankcase ventilation structure.Owing in this suction tude, there are more or less some strong negative pressure according to the internal combustion engine state, so must take preventive measures, because otherwise will for example undesirablely from the outside air be sucked crankcase by the bent axle shaft sealing in order to avoid negative pressure is transferred in the crankcase on a large scale.

DE4406986A1 has proposed a kind of crankcase vent valve of the above-mentioned type for this reason., be provided with a hole here in covers for housing, it makes the exocoel at the place, diaphragm side of crankcase dorsad be communicated with barometric pressure.But this has such shortcoming, and promptly outlet pipe is arranged in crankcase side and is positioned at the opposite that is full of atmospheric chamber, and air pipe that therefore must a complexity passes crankcase and stretches to the sucking pipe of internal-combustion engine from ventilation valve., under the different different internal-combustion engines mounting point situation of internal-combustion engine sucking pipe distance, must make amendment at ventilation valve.

Therefore, task of the present invention provides the crankcase vent valve of the above-mentioned type for use, and wherein above-mentioned shortcoming has been overcome and this crankcase vent valve just can be used widely in the internal-combustion engine mounting point of need not worrying.

According to the present invention, finished task of the present invention by a kind of like this internal-combustion engine with crankcase vent valve, it has a valve casing, a suction tude that is communicated with the inner chamber of crankcase, an outlet pipe that links to each other with the sucking pipe of internal-combustion engine and a diaphragm, described diaphragm is divided into valve casing inner relative its outer exocoel with of inner chamber of relative crankcase and has a ventilation valve valve head, wherein diaphragm utilizes the ventilation valve valve head to open or close outlet pipe selectively according to the pressure reduction between these two chambeies, wherein the exocoel of valve casing is communicated with suction tude, also formed a ventilation flue of arranging towards crankcase, it makes the inner chamber of valve casing be communicated with barometric pressure.。

This has such advantage, and the outlet pipe that promptly has a crankcase vent valve of a pipe connector that links to each other with the internal-combustion engine sucking pipe is arranged on the valve casing side of crankcase dorsad and therefore need not just can be adapted to different internal-combustion engine mounting point and installation environment widely expensively.And the member of being determined by the structure of crank case of internal combustion engine basically is arranged in crankcase side, thereby can adopt a distinctive general crankcase at different internal-combustion engine mounting points, as long as wherein make a suction tude guiding of freely touching suitable.

This for example can realize in special simple embodiment like this, be that valve casing is designed to two-part, it has a base and the lid at a side opening, in described lid, offered outlet pipe integratedly, wherein base be designed to rotational symmetric, lid at least with position that base links to each other on be designed to rotational symmetric.The lid of band outlet pipe links to each other with base on such position when mounted, and promptly outlet pipe points to ideal orientation according to the internal-combustion engine mounting point.Can save the additional adaptation hose coupling that is used for different internal-combustion engine mounting points between the ventilation valve that may exist and the internal-combustion engine sucking pipe thus, and always can be at optimum orientation adjusted or calibration outlet pipe to lead to the sucking pipe of internal-combustion engine.

Install simply and cheaply for one and realize thus, be i.e. base and comprise also that selectively ventilation flue is designed to be integral with crankcase.

In an advantageous modification of the present invention, diaphragm overcomes pressure ground in the crankcase side inner chamber by a pre-tensioning of spring.Can regulate the predetermined pressure of crankcase thus by spring force.

Very simple but arrangement work safety simultaneously obtains thus, and promptly spring is that a stage clip and especially helical spring and it are arranged in the exocoel.

Ventilation flue preferably is designed to be integral with crankcase or be integral with the crankcase top cover.

In conjunction with the accompanying drawings from dependent claims and follow-up to having drawn further feature of the present invention, advantage and favourable design proposal the description of giving an example of the present invention.Wherein:

Fig. 1 is a cross-sectional view;

Fig. 2 is a longitudinal section;

Longitudinal section when Fig. 3 is the ventilation valve unlatching;

Fig. 4 is a plan view.

The preferred embodiment of the crankcase vent valve of the present invention 10 shown in Fig. 1,2 has a valve seat 14 and a lid 16 on the top cover 13 that is loaded on the crankcase 12, they have constituted

valve casing

14,16 together.Installed in

valve casing

14,16 and be bearing in a diaphragm 18 on the bearing 20, it is separated into two

chambeies

22,24 with

valve casing

14,16 is cavity of resorption 22 and epicoele 24.Cavity of resorption 22 is arranged in crankcase side, and epicoele 24 takes shape in

valve casing

14,16 sides back to crankcase 12 relatively.Lower crankcase 12 here be considered to by a cylinder crankcase of holding impeller and dress cylinder head thereon form overall.

The bearing 20 of diaphragm 18 and the valve seat of valve casing 14 are made one with top cover 13.Can be contained in lid 16 on the valve seat 14 and also have the outlet pipe 28 that one of a band is used for the arm 30 that links to each other with a unshowned internal-combustion engine sucking pipe.So, epicoele 24 links to each other with the sucking pipe of internal-combustion engine.Thereby turn back to the combustion process of internal-combustion engine and do not leak in the environment by the crankcase air 38 that suction tude 32 flows into epicoeles 24 and go.

A ventilation valve valve head 34 so has been installed on diaphragm 18, and promptly it opens or closes outlet pipe 28 selectively when diaphragm 18 to-and-fro motion.For this reason, cavity of resorption 22 communicates with the external world by a ventilation flue 26 in crankcase side.So, in cavity of resorption 22, always exist atmospheric pressure.Because epicoele 24 links to each other with the sucking pipe of internal-combustion engine, so always have pressure reduction between epicoele 24 and cavity of resorption 22, this pressure reduction equals the pressure reduction between internal-combustion engine sucking pipe and the external environment.When sucking pipe was in negative pressure in other words, diaphragm 18 was upwards pressed in Fig. 1,2 at epicoele 24, and ventilation valve valve head 34 has been closed outlet pipe 28.This has prevented that automatically negative pressure from moving into crankcase 12 too much, may prevent that perhaps air from seeing through the bent axle axle sealing structure and being inhaled into crank shaft case 12.On the other hand, certain negative pressure is desirable in crankcase vent valve 10, thereby correspondingly extracts crankcase air 38 out.

Be provided with a spring 36, it is designed to helical compression spring 36 forms and is arranged in the epicoele 24 for this reason.From the meaning of opening ventilation valve valve head 34 by active force, spring 36 overcomes atmospheric pressure and promotes diaphragm 18, thereby ventilation valve valve head 34 is at first closed outlet pipe 28 under the pressure reduction between the

chamber

22,24 predetermined by spring force.Under the situation that outlet pipe 28 is opened, make crankcase 12 air be entered the sucking pipe of internal-combustion engine.In addition, under the pretensioning of spring 36, regulating the peak suction in the internal-combustion engine sucking pipe, till realizing exhaust always.If pressure reduction between aspirating unit and the barometric pressure or negative pressure raise and surpass the value of being scheduled to by spring 36, then external high pressure is closed outlet pipe 28 by diaphragm 18 and ventilation valve valve head 34.

Under the state shown in Fig. 1,2, outlet pipe 28 is cut out by ventilation valve valve head 34.And the state of Fig. 3 when showing outlet pipe 28 and opening.Here, negative pressure in the enough big or epicoele 24 of spring force is enough little, crankcase air 38 flows into the internal-combustion engine sucking pipes from crankcase 12 interior flowing out to the epicoele 22 and by outlet pipe 28 and arm 30 through valve casing 13, and wherein the weak negative pressure in the sucking pipe perhaps helps this process.

According to the mounting point such as the vertical or horizontal structure of internal-combustion engine, necessary is that arm 30 must be aimed at corresponding another direction to link to each other with the sucking pipe of internal-combustion engine.For this reason, lid 16 outer circumferential faces that contact with valve seat 14 are designed to rotate symmetric form and valve seat 14 also is designed to rotational symmetric.So, lid 16 all is installed on the valve seat 14 on position, any angle and is attached thereto, thereby arm 30 can be regulated around lid at 360 degree on the angle arbitrarily.This is being used for representing that Fig. 4 of two angle adjustment arms 30 has illustrated.Connect preferably and realize, but can imagine that also other scheme is as boning, being threaded or ultrasonic welding by friction welding.

A prominent features of crankcase vent valve 10 is, at the back side of diaphragm 18 in other words from inboard or in the air communication of crankcase side by an one, as being opened in passage 26 realizations crankcase 12 top covers 13 in.

For example on a streamwise, be arranged in suction tude 32 fronts and the unshowned labyrinth sealing in top cover 13 float chambers 12 in carry out oil and separate.If oil still enters epicoele 24 with crankcase air 38, then it may be in epicoele 24 as with lid 16 sides that separate on separate and be back to again in the crankcase 12 by suction tude 32 subsequently.

Claims

1. crankcase vent valve (10) that is used for internal-combustion engine, has a valve casing (14,16), a suction tude (32) that is communicated with the inner chamber of crankcase (12), an outlet pipe that links to each other with the sucking pipe of internal-combustion engine (28) and a diaphragm (18), described diaphragm is with valve casing (14,16) be divided into relative its outer exocoel (22 of the inner inner chamber of a relative crankcase (12) with one, 24) and have a ventilation valve valve head (34), wherein diaphragm (18) is according to these two chambeies (22,24) pressure reduction between utilizes ventilation valve valve head (34) to open or close outlet pipe (28) selectively, it is characterized in that, valve casing (14,16) exocoel (24) is communicated with suction tude (32), also formed a ventilation flue (26) of arranging towards crankcase (12), it makes the inner chamber (22) of valve casing (14,16) be communicated with barometric pressure.

2. crankcase vent valve as claimed in claim 1 (10) is characterized in that valve casing is designed to two-part, and it has a valve seat at a side opening (14) and a valve gap (16), has offered outlet pipe (28) in described valve casing integratedly.

3. crankcase vent valve as claimed in claim 2 (10) is characterized in that, valve seat (14) is designed to rotational symmetric, valve gap (16) at least with position that valve seat (14) links to each other on be designed to rotational symmetric.

4. as claim 2 or 3 described crankcase vent valves (10), it is characterized in that valve gap (16) links to each other by friction welding with base.

5. as the described crankcase vent valve of one of claim 2-4 (10), it is characterized in that valve seat (14) and crankcase (12) or be integral with the top cover (13) of crankcase (12).

6. the described crankcase vent valve of one of claim (10) as described above is characterized in that, ventilation flue (26) and crankcase (12) or be integral with the top cover (13) of crankcase (12).

7. the described crankcase vent valve of one of claim (10) as described above is characterized in that, diaphragm (18) overcomes pressure in crankcase side inner chamber (22) by the pre-tensioning of a spring (36).

8. crankcase vent valve as claimed in claim 7 (10) is characterized in that, spring (36) is that a stage clip and it are arranged in the exocoel (24).

9. crankcase vent valve as claimed in claim 8 (10) is characterized in that, described stage clip is a helical spring.